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US 9,683,056 B2Granted
Activating agents for hafnium-based metallocene components
AssigneeTotal Research & Technology Feluy
InventorsVincenzo Busico, Roberta Cipullo, Roberta Pellecchia, Abbas Razavi
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Abstract
The present invention discloses an active metallocene catalyst system prepared with a hafnium-based metallocene catalyst system and an activating agent comprising an aluminoxane and a sterically hindered Lewis base.
Claims21
A method comprising:
- preparing a metallocene catalyst system by combining a hafnium-based metallocene catalyst component and an activating agent;
- wherein the hafnium-based metallocene catalyst component is of formula II
- R″ (FluR′m)X Hf Q2 (II)
- wherein Flu is a fluorenyl ring;
- wherein each R′ is the same or different and is hydrogen or a hydrocarbyl radical containing from 1 to 20 carbon atoms;
- wherein m is an integer from 0 to 8;
- wherein each Q is a hydrocarbyl radical having from 1 to 20 carbon atoms, a hydrocarboxy radical having from 1 to 20 carbon atoms or a halogen and can be the same or different from each other;
- wherein X is a hetero atom ligand with one or two lone pair electrons and is selected from group 16;
- and wherein R″ is a structural bridge between Flu and X;
- wherein the activating agent has a low or no co-ordinating capability and comprises an aluminoxane and a Lewis base, and wherein the activating agent comprises a ratio of Lewis base to total aluminum of from 0.5:1 to 0.9:1;
- and
- wherein prior to the combining of the hafnium-based metallocene catalyst component and the activating agent, forming the activating agent by:
- mixing the aluminoxane with the Lewis base;
- and
- reacting the aluminoxane and the Lewis base for a period of time sufficient to reach equilibrium, wherein aluminum alkyl present in the activating agent is neutralized by the Lewis base.
12 more elements
A method comprising:
- mixing an aluminoxane containing aluminum alkyl with a Lewis base, wherein the Lewis base is a multi-substituted phenol;
- reacting the aluminoxane and the Lewis base for a period of time sufficient to reach equilibrium, wherein the aluminum alkyl is neutralized by the Lewis base, to obtain an activating agent comprising the aluminoxane and the Lewis base;
- combining a hafnium-based metallocene catalyst component and the activating agent;
- wherein the hafnium-based metallocene catalyst component is of formula II
- R″ (FluR′m)X Hf Q2 (II)
- wherein Flu is a fluorenyl ring;
- wherein each R′ is the same or different and is hydrogen or a hydrocarbyl radical containing from 1 to 20 carbon atoms;
- wherein m is an integer from 0 to 8;
- wherein each Q is a hydrocarbyl radical having from 1 to 20 carbon atoms, a hydrocarboxy radical having from 1 to 20 carbon atoms or a halogen and can be the same or different from each other;
- wherein X is a hetero atom ligand with one or two lone pair electrons and is selected from group 16;
- and wherein R″ is a structural bridge between Flu and X;
- wherein the activating agent has a low or no co-ordinating capability, and wherein the activating agent comprises a ratio of Lewis base to total aluminum of from 0.55:1 to 0.75:1.
9 more elements
Dependencies are inferred from the claim text.